So you let youself go, never wanting the rush to end.
Your humanity lets go of your repressed curse, and join the curse braying instead.
You fumble to open the bottle with thickening fingers, caring little of the shocked cries of Grace and Steve when your tail snakes through your ripping pants and whips the both of them. You chuck the entire bottle down through a stretching muzzle, ears perking proudly between a short bristly mohawk. Your clothes give away from the muscles and mass building underneath, revealing thighs and calves more suited on a donkey than a human; shoes splitting open for shiny black hooves to poke through. Your chest expands before the horrified eyes of everyone in the room, before you slam the empty bottle down with an earsplitting-
"HAAAAAAAW-HEEE!".
The crowd goes hysterical, scrambling to leave. Steve and Grace just watch you dumbly as the last of your humanity fades away, limbs and spine rearranging themselves to suit walking on fours rather than twos. You're just happy and fine where you are, thoroughly drunken and hazed by the magic-induced high. Perfectly unaware of your rising fame across multiple social media, your entire metamorphosis having been caught on multiple phones and cameras and spread onto the Internet...
=====
And that's the story of how you managed to take down Pleasure Island... At the price of your mind and humanity.
As the Island reels in shock and disbelief at how they seemed to have mixed up the brews and cigars meant to dull minds or twist forms (They didnt mess up, it's all just you accidentally releasing the hold you had over your curse). The world bands up together and roots the Island up in all of its infamous glory, bringing the centuries-old schemes to ruin. While you and the rest of the victims can only be stuck behind fences and stalls, at least there won't be any more unfortunate souls that would end up joining your ranks. Not that you mind the lost of your fingers or human life, you're too far gone as the jackass you are to comprehend the loss - you're simply content to graze and rut around.
=====
The End?